Apparatus for fusing and spraying pulverized substances



Feb. 22, 193s. l F, SCHOR, 2,108,998

APPARATUS FOR FUSING AND SPBAYING PULVERIZED SUBSTANES- Find March 12,1955 2 sheets-sheet 1 JF d f 40 35 *lf J2 50 Z6 @56156 ,J3 37 Feb. 22,1938. F. scHoRl v 2,108,998

APPARATUS FOR FUSING AND SPRAYING PULVERIZED SUBSTANCES Filedmaron 12,1955 2 sheets-sheet 2 INVENTOR lfaym ATTO YS Patented Feb. 22, E938APPARATUS FOR FUSIING AND SPRYENG PULVERIZED SSTANCES Fritz Schori,Wetzikon, Switzerland Application March i12, H5935, Serial No, M525 linBelgium hdareh i12,

i2 maints.

The invention relates to coating apparatus oi.

reissued June 22.1937, No. 20,425, that is to say.

10 apparatus consisting generally of a hand sprayer devicehose-connected to appropriate sources of supply of the spray componentsbut itself adapted for ready manipulation to meet the exigencies of thework. The present improvements concern especially the organization ofthe spray device. to the end of providing for better control -of thespray and its components, and also the provision of improved means forensuring an appropriate powder supply for such device, all as moreparticularly set out in the ensuing description.

In the accompanying drawings Fig. 1 is a part sectional view of apreferred form of spray device embodying the invention; Fig. 2 is aview, partsectional on the line II--II of Fig. 1; Fig. 3 is a section,somewhat enlarged,l on the line llIII---IllI of Fig. i; Fig. 4illustrates a preferred form of powder receptacle and Fig. 5 a modifiedform of receptacle.

:m The hand apparatus illustrated is preferably of pistol form,comprising generally the barrel section i and handle 2, the lattercontaining supply passages for the several spray ingredients and theformer organized to distribute and direct such ingredients to the pointof discharge.

Passage il in the handle supplies the combustion iuid, such as a mixtureof oxygen and acetylene, by way of a mixing unit indicated at large bythe reference l. This unit comprises a body lo portion having nipples 5and 8 to receive hose n in) connections from gas bottles or appropriatesources of supply of oxygen and acetylene, re-

spectively. As shown in Figs. l and 2, the oxy gen supplied to nippleenters chamber i and passes into chamber d by way of port 9, asdetermined by the setting of valve IQ. From chamber d it passes througha central bore Il in plug l2. The acetylene supplied to nipple t, enterschamber l@ and ,passes into chamber ld by way of port l5 under thecontrol of a valve similar to valve iii. From chamber ld it passesthrough slots it in the outer, threaded surface of plug i2 anddischarges around the upper endof the plug, thoroughly mingling with theoxygen discharging through bore li and, with it, discharg ('Jl. www2)ing into an expansion chamber il formed in stern iti. By thisarrangement thetendeney for bacio ring to occur in the handle of thepiston is re= duced/to' a minimum.

Stem i@ is threaded throughout a portion oi? d its length, as at ide,and by means of nut 2@ is drawn up tight in the pistol handle, whichconstruction aiso permits ofthe removal or the mix= ing unit bodily, as.for cleaning or inspection, without disturbing the adjustment ofoxygen' valve l0 or its companion valve for the acetylene.

Passage I9 in the handle terminates at its lower end in a nipple 2i) forhose connection to another source of uid under pressure, preferably andhereinafter referred to as compressed air,y which is supplied to thepistol, through passage i9 and under the control of a shut-oil valveZI,- for the purposes below described.

Passage 22 formed in the handle parallel to the passage lil is connectedby its nipple 23 and u1 a hose (48) with the supply of the fusiblepowder to be sprayed.

In the barrel portion of the pistolis seated a distributing sleeve thehead 25' of which has a. central bore 2t and two sets Ioi ducts marked.a 2l and 2d, respectively, and at the forward end of head i5 aremounted spaced concentric sleeves 29, t@ and 3i, the last-mentionedcarrying the nozzle cap 32. As thus organized, the gas supplied by wayof passage 3 flows through ducts 2l w.

and emerges at the annular ame oriices 33. Surrrounding the flameorifice is an outer orifice 3d to which compressed air is supplied frompas sage i9 by way of ducts 2d, the air sheath thus formed increasingthe projection velocity of the $5 enveloped spray. Furthermore and asshown ln Fig. 3, the air sheath orice is preferably of el liptical form,whereby the advantage is secured that the larger volume oi airdischarged at the sides of the dame serves to hatten the latter, opermitting e. brush-like application of the spray nd ensuring maximumcovere, with uniform- .V- f According to my invention a portion of thissame air supply is applied to still another pur- 45 pose, viz. thetransportation of the powder to the pistol, as will new be explained.

At the rear oi the barrel portion oi the pistol is inserted an aspiratorunit consisting of a body portion 3E having a forwardly extending stem36 50 which is threaded into the head of sleeve 2li. An aspirator nozzledi projects into a suction chamber 3d which is connected by ducts S9with an annular groove d@ into which passage 2d discharges.

The body portion of the aspirator unit 55,

" is also traversed by ducts 4i, by which a portion of the compressedair supplied to the pistol by way of passage i9 is conducted to theaspirator,

whence it is discharged into and through the central bore 42.. A suctionilow is thus induced in passage 22, by which the powder to be sprayed isdrawn from the source of supply into the suci tion chamber, whence it isprojected, with the may be adjusted as required by needle valve 42,

and this adjustment is accomplished without of itself. materiallyaffecting the proportions of the flame and air components of the spray,as will be apparent. In this connection it will be seen said priorpatent, viz. of placing adjacent, but l that all of the spray componentsare capable of adjustment into a fixed relationship the one with theother,'to produce a desired flame and a continuously uniformflame-spray, dependent, of course upon the admission to it of acorrespondingly uniform supply of powder.

In this latter regard the invention contemplates the use of theprinciple disclosedin my outside of the body or mass of powder a hole orholes by which air is admitted to satisfy the suction created by thepistol and thereby produce a suction-induced air stream for transportingthe powder to the flame at a non-fluctuating rate, but according to thisinvention such powder-bearing air current and also the powder receptacleare organized for better and quicker control of the delivery of powderto the flame without tendency to overfeed-the powder` upon theresumption of the air current after an interf ruption.

In the preferred form illustrated in Fig. 4, the powder is contained ina double chamber or hour-glass type of receptacle, formed by the twoconical cans 44 and 45 connected by a narrow passage or throat 46 whichmay be provided with a shut oif valve (not shown) and which permits acontinuous gravity feed from the upper to the lower can. The throat isprovided with a horizontal outlet duct 49 terminating in a nipplefitting 41 by which it is connected by hose 4l to the pistol nipple 23.'It is also provided with an air inlet duct 50 to which air is admittedby way' of port li under the control of valve 52. The air from thisentrance passes across the throat and forms the air stream by which thepowder is borne to the flame through hose 48. It falls through thethroat from the upper can and is picked up by this air stream so long asthe stream is allowed to ow and such of it as is not thus picked upcontinues on through into the lower can. Each e'nd of the receptacle maybe provided with a hook 53 by which it may be suspended and by means ofwhich it can be reversed end for end when the upper can becomesexhausted thus to utilize the powder that was not picked up by the airstream. As in my said prior patent an unbalanced air motor may beprovided to agitate the container and thereby ensure a uniform flow ofpowder, and such a device is shown at 54.

In Fig. a single powder-receptacle 55 is shown, likewise adapted to beagitated by a motor 54, but .in this form the flow of the powder doesnot continue during the interruptions of the air-stream flow. Thereceptacle discharges through a narrow throat 46* directly into the boreinto the;v

`V-Junction of two angularly related passages 58 and Il. The former ofthese is connected to the pistol by way of the hose 48 and the other isfor the admission of air by way of the vent Il controlled by thevalve-screw IQ. Together they constitute part of the path for theconveyor air stream that flows to the pistol and they are of about thesame diameter as the throat. Because of their relatively steep anglethey do not fill up with powder descending from the receptacle, on thecessation of the air flow. to such an extent as to form an'objectionableslug of powder to pass into the pistol on the resumption of the liveflow. Thus in both forms of receptacle the powder-carrying airstream canbe stoppedl and started as desired without resulting in an initialoverfeed of powder.

The stopping and' starting of the powdercarrying air stream, which isnormally necessary from time to time in the progress of the work,

is controlled vin a simple manner and without disturbing the llamecharacteristics or requiring the repeated adjustment of any of thecontrol valves. This is accomplished by providingl an alternative orsecond'air admission passage by which to satisfy the suction that isproduced by the aspirator in the pistol, and which takes the form of anair duct 80, constituting a branch of passage 22, and terminating in aport 6I located at the rear of the pistol handle in position to becovered or uncoveredat will lby the thumb ofthe operator holding thepistol. When the port is uncovered the aspirator suction is satis-4 edby air entering direct from atmosphere through duct 60 thereby soreducing the suction eil'ect in the hose 48 as to render itsubstantially ineffective to convey powder to the pistol. Restoring thethumb on the hole 6| causes resumption of the powder feed to the pistoland in either case substantially the same amount of air will flow to theflame spray.

1. Coating apparatus comprising a flamespraying device for fusiblepowder having passages therein to conduct and discharge the spraycomponents, including a passage adapted for connection at its entranceend to a supply of air under pressure and having two branches separatelyleading to the point of iiame discharge of the apparatus, fusible powdersupply means asflame discharge and adapted for connection to acombustible mixture supply.

2. Coating apparatus comprising a flamespraying device containingpassages for the spray components conducted thereto under pressure andincluding an aspirator, means for diverting part of the flow of one ofsaid pressure spray components through said aspirator for the operationthereof, and thence to the spray, the remaining part of said componentpassing direct to the spray, a fusible powder supply passage subject tothe suction created by said aspirator and a fusible powder containerprovided with means for constant rate delivery of the powder into saidsuction supply passage.

3. Coating apparatus comprising a iiame spraying device having meansforming an-annwlar. flame discharge orifice, a central passage and anouter, annular orifice, a passage in the device communicating withsaidvfiame orifice and adapted for connection to a combustible mediumsup'n ply, a second passage in said device adapted for connection to acompressed air supply, aspirator means adapted to discharge into saidcentral passage, a suction passage subject tothe action ofthe aspiratormeans, means for feeding lpowder to the suction passage for deliverytherethrough by the aspirator-induced suction, and means whereby aportion of the compressed air supplied to said second passage isvdischarged through said outer, annular orifice and means for dischargingthe balance of such air through aspirator means. Y v

4. The combination of aame-spraying device having aspirator meanstherein, means forming a passage subject to the suction of saidaspirator means, and having an air admission port whereby a streamA ofair therethrough is induced by said aspirator means, 'and a receptaclefor a supply of fusible powder comprising upper and lower containershavingmeans forming a passage cone necting the same to permit gravitynow of powder from one container to the other, such passage and thefirst mentioned passage intersecting one another, whereby thesuction-induced air stream intersects the path of the Afalling powderand such powder as is not picked up by the air stream falls through intothe lower container.

' 5. The combination .of a name-spraying device having aspirator meanstherein, means form ing a passage subject toLthe suction of saidaspirator means, an air duct including a 'downwardly inclined portionand an adiacent, upwardly inclined portion, a container for a supply orpowder having an outlet arranged to permit gravity discharge of thepowder therefrom at the junction of said duct portions, a hoseconnection from said upwardly inclined portion to said passage, andmeans for controlling the aspiratorinduced suction in such passage.

6. Coating apparatus comprising in combination a flame-spray pistoladapted to discharge uid ingredients supplied thereto under pressure,aspirator means associated with said pistol and adapted for operation byone of said ingredients. a container for a body of fusible powder tobesprayed, a powder supply passage subject to the suction of saidaspiratormeans,

means for conducting the powder from its container into the air streaminduced in said passage by said aspirator means, and means for startingand stopping the flow of powder through said passage comprising an airadmission Vport for said passage adapted to be normally closed by l thehand holding said pistol and located intermediete the aspirator and thepoint of discharge of powder into the passage, said port having acapacity adapted to 'satisfy .substantially the whole of the .aspiratorsuction.v

'7. Coating apparatus comprising in combina.- tion a flame-spray pistoladapted to discharge uid ingredients supplied thereto under pressure,aspirator means associated with said pistol and adapted for operation byone of said ingredients, acontainer for a body of fusible powder to besprayed, a powder supply passage subject to the suction of saidaspirator means, a port located to admit air to said last mentionedpassage other than through the body oi powdera in said container, meansfor, conducting the powder from its container into the stream oi" airentering said port and owing through said passage under the suctioninduced by said aspirator means and means for 'starting y and stoppingthe now o powder through the passage comprising an 4air admission portfor said passage adapted to be normally closed by the hand holding saidpistol and located intermediate the aspirator and the point of dischargeof powder intothe passage, said port having a vcapacity adapted tosatisfy substantially the whole of the aspirator suction.

8. Coating apparatus of the character described including a powdersupply device comprising two containers connected by passage means, aspray pistol, iced conduit means .for the pistol connected to saidpassagev means, and means for supporting said powder supply device witheither container uppermost. v 9. Apparatus as in claim 2 having threespray component passages concentrically arranged at the spray oriiice,the outermost passage conducting air and being of elliptical form togive a fiattened spray.

io. Coating apparatus comprising a flamespraying pistol containingpassages tor fuelgas and compressed air and including an aspirator,meansfor diverting part of the compressed air now in one of saidpassages through said aspirator i'or the operation thereof and thence tothe spray, the remainder of such compressed air passing Adirect to thespray, a powder-supply passage subject to the suction created by saidaspirator, a

container kfor fusible powder having constant rate delivery means intosaid suction supply passage, said latter passage having two entrancestor atmosphere, one being located beyond the point of connection thereofwith said container and the other being on the pistol under theoperator's control and adapted when open to satisfy the whole suctiondemand of saidaspirator.

il. Coating apparatus as described comprising a flame-spray device inthe Ilorm of a pistol containing passages for the several spraycomponents, all having their entrance vendsv in the handle end of thevdevice and one being a combustible mixture passage, a fuel and airmixing de vice having hose connections respectively for its supplies offuel and air and means for removably attaching said mixing device to thepistol handle in communication with said combustible mixture passage.

l2. Coating apparatus comprising a flamespraying device containingpassages for pressure spray components and including an aspirator,

means for diverting part of the flow of one ofsaid spray componentsthrough said aspirator for the operation thereof and thence tothe spray,the remaining part of said component passing direct to said spray, and afusible powder supply passage subject to the suction created by saidaspirator,

in combination with stopping and starting means x comprising an airentrance to said aspiratorsuited for satisfying thewhole suction demandthereoi.

FRITZ SCHORI.

